The correct answer is A. Tendu leaves.
Tendu leaves are used for bidi-making and considered as one of the main sources of revenue of Jharkhand. Tendu leaves are also used in making traditional Indian musical instruments like the tabla and dholak.
Shellac is a resinous substance produced by the female lac bug. It is used in a variety of applications, including varnishes, adhesives, and sealants. Shellac is not a tree species.
Teak is a hardwood tree that is native to tropical Asia. It is used in a variety of applications, including furniture, flooring, and boat building. Teak is not a major source of revenue for Jharkhand.
Jamun is a fruit tree that is native to India. The fruit is edible and has a sweet and sour taste. Jamun is not a major source of revenue for Jharkhand.